ISO 9542
Connectionless-Mode End System to Intermediate System Protocol
ESH (End System Hello) Address Part
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CLNS ES-IS uses different PDU type with this structure:
1. A fixed part, used by all PDU types;
2. a variable address part (depends on PDU type);
3. an options part (optional; depends on PDU type).
Protocol ID (1 byte)
Protocol: ISO 9542 / CLNS ES-IS
PDU Part: ESH (End System Hello) Address Part
Field: protocol ID
Length: 1 byte
Contents: protokoll identifier.
Number of Source Addresses (1 byte)
Protocol: ISO 9542 / CLNS ES-IS
PDU Part: ESH (End System Hello) Address Part
Field: number of source addresses
Length: 1 byte
Contents: number of the following source addresses.
Source Address Length (1 byte)
Protocol: ISO 9542 / CLNS ES-IS
PDU Part: ESH (End System Hello) Address Part
Field: source address length
Length: 1 byte
Contents: length of the following address
Since ISO addresses vary in length, the current length must be indicated.
Source Address (n bytes)
Protocol: ISO 9542 / CLNS ES-IS
PDU Part: ESH (End System Hello) Address Part
Field: source address
Length: n Bytes
Contents: source address.
Since ISO addresses vary in length, the current length must be indicated within the previous 'source address length' field..